气象常用表(第三号)可照时数订正

CORRECTION FOR DATASET DURATION OF POSSIBLE SUNSHINE IN METEOROLOGICAL TABLE 3

在地面观测业务中观测日照时数时,气象常用表(第三号)可照时数常用于参与计算或作为日照时数有误判定的参考,目前的可照时数由公式直接计算,已不再使用查表方法得出。鉴于气象常用表可照时数在地面观测业务使用中的重要性,订正错误数据可对历史可照时数有关的分析进行修正。利用太阳时角公式编程计算得到12个月的可照时数,与气象常用表(第三号)可照时数表数据对比分析,对出现错误的数据逐步查错并订正。通过查表,订正过的正确可照时数可为出错数据纬度附近的各台站历史可照时数进行修正,也可为可靠的观测结果提供参考。

When sunshine duration is observed in the ground service,a dataset of duration of possible sunshine in Meteorological Table3used to be taken into account in the calculation or as a reference to determine the presence or absence of errors in sunshine duration observation.However,direct formula computation has been employed at present to produce duration of possible sunshine as a replacement of Meteorological Table consultation.In view of the Significance of determining sunshine duration dataset from the Meteorological Table3in ground observation,correction of errors with historical data in the Table can subsequently improve Table data-based analyses.By programming computation with the formula of solar hour angle,duration of possible sunshine data over12consecutive months in one year are obtained. Through comparing the data with their counterparts in Meteorological Table3,errors are located gradually and revised accordingly.Furthermore,the updated duration of possible sunshine in Meteorological Table3can both revise the historical records of observation stations of adjacent latitudes wherever erroneous data arise and provide reference for more reliable observation outcomes.